Frank (whale)

Frank is a cameo character seen only in the episode "You Don't Know Sponge". He is the whale who hears Patrick's imitation of a blue whale. He is shown wearing a green coat with yellow buttons and a brown hat and carrying a briefcase. He is walking alongside an unnamed beige fish. He is a blue whale with dark blue and gray skin. When Frank hears the noise, he thinks it's his ex-wife Martha calling. Until the other fish assures him that Martha is no good for him.